Though it has a couple different meanings, most often ἐκκλησία is translated as "church" in the NT. I'm wondering, though, whether its use in 1 Corinthians 14:34 might be distinguished from its use in the end of 14:33. The ESV reads:

As in all the churches of the saints, 34the women should keep silent in the churches.

The word "churches" seems redundant here. Some have therefore concluded that the phrase "as in all the churches of the saints" belongs with the previous sentence, so that it would read: "For God is not a God of confusion but of peace, as in all the churches of the saints." This seems like a fairly trite thing to add and almost would seem to imply that God is a God of peace only in the churches, but elsewhere he is a God of confusion. I would almost rather assume Paul is redundant.

Is there any warrant, though, to think that in the span of a few words, Paul is using ἐκκλησίαις in two different ways so that he wouldn't be redundant? Do principles of translation permit such an approach?

I agree with you until the example. I agree that it's either for clarity or emphasis, but nothing suggests that Paul is choosing to focus on the specific Corinthian church(es).
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swasheckMay 7 '13 at 2:18

It seems more likely that this is a separate thought. God not being the God of confusion fits more naturally with what has preceded the statement, namely that the spirits of the prophets are subject to other prophets.

The next set of thoughts begins "As in all the churches of the saints, the women must be silent." The present imperative can carry inceptive force so it could also be "... must start being silent."

There's nothing in the grammar itself that would differentiate it from the first usage. Therefore, I'd say that it is either for clarity or emphasis. Emphasis seems more likely given the context of the Corinthian correspondence - and I would specifically note that this is probably an emphasis on church order. It is only within the realm of these meetings that this command has jurisdiction. This isn't a command to be silent and uninvolved in all of life, but rather that for the sake of church order and the witness of the chirch, the women were to start being silent.

This seems to be an accurate observation to me. I would then assume and suggest the following relevance:

It is necessary for the apostle to say it this way in order not to be mistaken. By using the word twice he makes clear that it is not a general manner of conduct with the disciples in all churches (en ekklesiais tôn hierôn) all the time but is a specifical requirement during their time of coming together as a congregation for worship. Privately of course they speak and teach truth (We think of Priscilla in connection with Aquila, Paul, and Apollos) but publicly in the face of the assembly they remain silent (in order not to use authority over husbands of other wives in audience. For related reason men in speaking to the church do not directly address women as they are the wives of other husbands.)

So there may really be this double meaning intended:
ekklesia as a term for a community of people (disciples) and, secondly,
ekklesia as the term for the actual meeting.

and the spirits of prophets are subject to prophets; for God is not a God of confusion but of peace, as in all the churches of the saints.

The women are to keep silent in the churches; for they are not permitted to speak, but are to subject themselves, just as the Law also says. -1 Corinthians 14:32-34

It seems we would first need to determine whether the ESV is even presenting an accurate translation by placing the two occurrences in the same sentence.

Regarding the "triteness" of this translation, consider that the Corinthian church was being rebuked for their elitism, and Paul is attempting to address a problem specific to their church. It seems perfectly appropriate for him to remind them that they are not the only church on the planet, and that they ought to behave in a more orderly manner, in accordance with the ministry of the Spirit in every other church on the planet. Just a few verses later he wraps up his rebuke to the Corinthian church on church order by asking a rhetorical question:

Was it from you that the word of God first went forth? Or has it come to you only? -1 Corinthians 14:36

The obvious "no" to this question needed to be emphasized to this church.